[apocalyptic0n3]

You could check out JetBrains AppCode[1], depending on how you're building. It still uses Xcode for the Interface Builder and Storyboard tools but you might be able to offload much of the process to AppCode. We've experimented with doing it, but I don't believe anyone has actually made the switch full time yet.

[1] https://www.jetbrains.com/objc/

[cocktailpeanuts]

My point was I would like to switch to Windows if I had the choice. This doesn't look like it's solving my problem. You still need to use mac.